Precise reactive power distribution method for microgrid based on distributed one-way communication
A technology of power distribution and one-way communication, which is applied in the direction of single-network parallel feeding arrangement, electrical components, circuit devices, etc., can solve the problem that the robustness of the communication network is not strong, and the microgrid cannot accurately distribute the load power and the amount of communication data. Large problems, to avoid reactive power circulation, accurate distribution of reactive power, and simple communication
Active Publication Date: 2021-09-03
CHONGQING UNIV
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[0008] In view of this, the purpose of the present invention is to provide a method for precise reactive power distribution of microgrids based on distributed one-way communication to solve the problem that the reactive power of microgrids in the technology cannot be accurately distributed according to the rated capacity. Problems such as weak network robustness and large amount of communication data
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[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0041] In this embodiment, the microgrid precise reactive power distribution method based on the distributed one-way communication mode, the control part of each distributed power generation unit in the microgrid includes a controller, and the control part of each distributed power generation unit in the microgrid The control part also includes the communication layer and the compensation function of the second layer.
[0042] In each distributed generation unit: the communication layer inputs the reactive power and reactive power droop coefficient of the previous distributed generation unit into the second layer compensation function for processing, and the second layer compensation function sends the processed virtual impedance value to To the main controller, the main controller distributes reactive power by droop control and virtual impedance value;...
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The invention discloses a micro-grid precise reactive power distribution method based on a distributed one-way communication method, which includes introducing a second-layer compensation function and a communication layer on the traditional virtual impedance method, and establishing distributed Communication mechanism between generating units. The invention adjusts the virtual impedance of each distributed power generation unit according to the reactive power droop coefficient, realizes the precise reactive power distribution among the distributed power generation units in the microgrid, and uses low-bandwidth wireless communication to form a communication layer without a centralized controller. The first and second distributed generation units exchange reactive power and reactive power droop coefficient information, and the remaining distributed generation units only need to know the information of the previous distributed generation unit, which not only retains the advantages of the traditional virtual impedance method , can also avoid reactive power circulation caused by line impedance differences, and has the advantages of simple communication, less data volume, operation when communication fails, and precise distribution of reactive power among distributed power generation units.
Description
technical field [0001] The invention relates to the technical fields of distributed power generation and micro-grid, in particular to a method for distributing reactive power of a micro-grid. Background technique [0002] In order to expand the power capacity of the microgrid, each distributed generation unit is connected to the AC bus of the microgrid in parallel to meet the increasing load power demand. The key to the stable operation of this type of microgrid is to solve the problem of power distribution among distributed generation units. [0003] Droop control is widely used in microgrid control systems without interconnection lines because of its adjustment characteristics of "voltage frequency-active power" and "voltage amplitude-reactive power", so that each distributed generation unit can be adjusted according to its rated capacity Proportional distribution of active and reactive power in the microgrid system. Since the system frequency of the microgrid is equal e...
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IPC IPC(8): H02J3/50H02J3/38H02J13/00
CPCH02J3/381H02J3/50Y02E40/70Y04S10/12
Inventor 陈家伟侯帅丞方觅黄智勇张财志
Owner CHONGQING UNIV